package cmcc.util;

import java.sql.*;

public class DB {

	public DB() {
	}

	public static Connection getConn() {
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager
					.getConnection("jdbc:mysql://localhost/cmcc?user=root&password=6203103");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	public static Statement getStatement(Connection conn) {
		Statement stmt = null;
		try {
			if (conn != null) {
				stmt = conn.createStatement();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return stmt;
	}

	public static ResultSet getResultSet(Statement stmt, String sql) {
		ResultSet rs = null;
		try {
			if (stmt != null) {
				rs = stmt.executeQuery(sql);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return rs;
	}

	public static PreparedStatement prepare(Connection conn, String sql) {
		PreparedStatement pstmt = null;
		try {
			if (conn != null) {
				pstmt = conn.prepareStatement(sql);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return pstmt;
	}

	public static void close(ResultSet rs) {
		try {
			if (rs != null) {
				rs.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public static void close(Statement stmt) {
		try {
			if (stmt != null) {
				stmt.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public static void close(Connection conn) {
		try {
			if (conn != null) {
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}
